The Norwood-Hamilton scale is a scale for the classification of male-pattern baldness. It is divided into seven categories as follows:

Type 1. No hair loss

Type 2. Minor recession of the frontal hairline

Type 3. Further loss from the front

Type 4. More dramatic loss from the frontal region and temporal area with additional hair loss at the top center of the head but with full hair between this area and the front

Type 5. The area between the bald spot at the top of the head and the front starts to thin

Type 6. The area is now bald

Type 7. The only remaining hair is found on the sides and the base of the back of the head